WISE OWL EXERCISES
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- Table-valued functions (6)
- Derived tables and CTEs (13)
- Dynamic SQL (4)
- Pivots (2)
- Triggers (2)
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SQL | Scalar functions exercise | Create various functions to show information about episodes
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First (if you haven't already done so) run the script shown above to generate the Doctor Who training database.
See how many of the following functions you can create in the time left to you!
-- show all these functions working
-- function to count number of companions for a given episode
dbo.fnNumberCompanions(EpisodeId) AS Companions,
-- function to count the number of enemies for an episode
dbo.fnNumberEnemies(EpisodeId) AS Enemies,
-- function to count the number of words (hint: use a combination
-- of LTRIM and RTRIM to remove leading and trailing spaces, then
-- REPLACE to change all spaces to empty strings and compare the
-- LEN of the string before and after this change!)
dbo.fnWords(Title) AS Words
Here's what you should see when you run the query, if you manage to create all of the functions listed:
Four episodes have 7 words each.
When (if?) you finish, optionally save your query as Too many functions.sql, then close it down.